stv4 is 20% viable in combination with stv2. stv1/stv2 and stv2/stv3 larvae derived from females containing stv- germline clones die during the first larval instar. stv1/stv2 larvae derived from females containing stv- germline clones show severely reduced or no detectable food uptake. Those larvae that show no food uptake do not grow from their hatching size, and those that do show some food uptake show only a minimal amount of growth compared to their zygotically rescued siblings. stv2/stv3 larvae derived from females containing stv- germline clones show severely reduced or no detectable food uptake. stv1/stv2 embryos derived from females containing stv- germline clones have a normal somatic muscle pattern.